@article{pereira_silveira_lanzer_samohyl_2002,  title={Productivity growth and technological progress in the Brazilian agricultural sector},  volume={22},  ISSN={0101-7438},  url={https://doi.org/10.1590/S0101-74382002000200003},  DOI={10.1590/S0101-74382002000200003},  number={2},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Pereira, Marcelo Farid and Silveira, João Serafim Tusi da and Lanzer, Edgar Augusto and Samohyl, Robert Wayne},  year={2002},  month={Jul},  pages={133–146} }